Maf Sensor Reading 0

I disconnected the negative battery terminal while I installed it, the code was there without even starting the engine. Improve the MAF readings "fuel trims" at the ECU. What MegaSquirt units can I use this sensor with? This one works with V2. If the MAF Sensor data in the data stream is zero then and the car will not drive, then the MAF is, clearly, defective. 0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Once we have MAF integrated over time, we can calculate fuel flow using a specific air/fuel mixing ratio (A/F). This means that your current MAF transfer will not be accurate for your new meter. This is the second MAP sensor reading. It's actually an IAT (Intake Air Temperature) sensor he was looking at that he thought was a MAF (Mass Air Flow) sensor and was calling a MAP sensor. MAF Values For a Typical Test Drive KOEO 0. The MAF (Mass Air Flow). Barometric pressure sensor fault causing base read problems (air flow calculations). thanks both :-) 0. Mass Air Flow (MAF) Sensor Circuit Low P0102 Detects a continuous short to low or a open in either the signal circuit or the MAF sensor MAF ≤ 1200 Hz Engine Running > 0 seconds Engine Speed ≥ 50 RPM System Voltage ≥ 8 volts The above must be present for a period of time greater than 0. Obtain sensor specifications from a reliable source; you can send us an e-mail from the Help Link and we can assist with most information. 0T, Volkswagen Jetta VI 2. Jumping ahead, this problem may have different causes, but in almost every Mercedes in the '90s, the most likely cause is the Mass Air Flow (MAF) sensor! MAF Functions. The vast majority of all MAF and MAP sensors are of this type. YEAR ENGINE FOOTNOTE OE # PART # ACURA TRUCK 6 CYL. Kia spectra Location:. Back again with same fault. Mafraw - the raw MAF sensor reading converted to g/ sec Mafsensor - the MAF reading after including a table fine tune correction (g/ sec). Hello, I have a 2005 BMW X5 with a MAF sensor signal code. I cannot get it to read higher than 2. I am getting a MAF signal code (P0102) and I know it is not working properly because the signal from signal wire is supposed to change from 0-5 volts when the rpm's increased and yes of coarse I back probed it, I even cut some of the insulation of of wire to make sure I was getting good connection while reading it with my multi-meter. P0103 MAF Signal High Input to PCM. However, this method is not perfect especially when the MAF sensor is half dead. – Poor fuel economy. Here is a fast and accurate way to track a MAF’s performance and output to the PCM. I wonder if there are other people having similar problems. As we all know, the prefect ration for oxygen and gas in the engine is 14. 5 V (1XAA) feed, OBD-II reported MAF V=1. The pink EGR actual trace on the graph roughly follows the EGR specified trace. 5L,05-08 G35 3. Diagnostic reads. 96-99 gm 350 vortec mass air sensor (Chester) $20 Mass Air Flow Censor Mini Cooper s (S. While trying to trouble shoot an issue, I came to the point where I needed to check the resistance of the MAF sensor between the THA and E2 terminals. 0L 1999: The iat sensor is the front sensor on the intake manifold it has a gray 2 wire plug that is the 4. My Wish List Edelbrock Universal Mass Air Flow Sensor Kit #15401 For GM Applications 95mm. Manifold Absolute Pressure, Mass Air Flow, and Intake Air Temp sensors. SLX 1999-1996 3. 1 kPa at 0 volts and 315. The Mass Air Flow (MAF) Sensor measures the flowrate of air through the air intake before reaching the engine. be/E8sBg7kMbOw The procedures shown in this video can be applied to all 3-wire General Motors MAF sensors. 0 8v TDI PD Engines, Here at Darkside Developments we only own and work with TDIs, so you can be assured that you are dealing with experts who have an in depth knowledge and understanding of all things VW Diesel. Both sensor designs output a 0. O2 Sensor Output Voltage-- The actual voltage being generated by the oxygen sensor (should be 0. Mass Air Flow Sensor Investigations No dealership or service provider, when contacted, has ever been able to provide us with evidence to support this "myth," and in fact, our investigations have revealed that even authorized dealerships are simply speculating and do not have the test equipment necessary to know whether the sensor has failed or why. Check your gasket where the TB bolts on. Unplug the MAF sensor's electrical connector. The MAF sensor reads the amount of air coming into an engine. Rather than calculating the air flow from the VE table and manifold pressure (MAP), the mass air flow sensor measure the amount of air directly. When all values are within the goal of 0. This How To will cover The Process of cleaning the EGR Valve And Related Parts Needed if you are having EGR Related Problems on the 2. This MAP sensor is mounted directly to the intake manifold, but others might be connected by a hose. The mass air flow sensor increases the voltage to maintain the temperature of the sensor. shore) $60 C&L 80mm MAF Mass Airflow Sensor for 86-93 5. I cleaned the sensor before thich is ese readings and got slight improvements but only slight. 55grams/second minimum to 1. 0 (x64) HEX-NET2 CB: 0. people's readings from fuel consumption sensors in modern cars about 0. Where the MAF sensor differs and simplifies the process is that it does the work of several sensors by quantifying the actual mass of air flowing through the intake. 1v for lean and 0. 0T, Volkswagen CC 2. wrt OBDII logs, however, MAP sensor seems to read low at 100KPA. MAF sensors read not just airspeed but the relative mass of the air which eliminates pressure and temperature as variables. The car runs rich at idling or lean when running. Or they set a code that sends you up barking the wrong diagnostic tree. When at rest, the MAP sensor reads atmospheric pressure at sea level (29. I got faultcode for MAF range. Vehicles with ESM use bothINCHES OF MERCURY (IN-HG) AND IN HERTZ the MAP and MAF for engine-running BARO (HZ). NOTE - this engine is not at Idle. 3 Most Common Bad MAF Sensor Symptoms. I bought MAF sensor cleaner and a new air filter (the old air filter was very dirty). The average for my last run was 0. Works like a hot wire system, but adds a second cold wire to provide a baseline reading with which the hot wire’s reading can be compared. What does a mass air flow sensor do? In a mass air flow system, the base fuel calculation is very simple. 0 Mustang (Fairmount / Museums area) $75. Any of these can cause one or more cylinders to misfire. 95 Subaru Impreza EJ18 - Issues similar to bad MAF sensor? So I've been having an ordeal with my Impreza as of late. The “air gulp” test uses a labscope to display the MAF output voltage increase during a snap-throttle test, and should show the voltage rising from about 0. I was wondering the same thing about the maf sensor. Ensure you measure the I. Is there battery voltage? YES-Go to step 8. Follow these instructions: youcanic com/guide/change-mazda-mass-air-flow-sensor-cost-symptoms. Finally, lift the MAF sensor from the metal body. MAP sensor reading. Old Sensor looked brand new so thot it was going to be something else. 0 upgraded intake boot plug to aluminum and only affected early kits) After considerable testing, we have found it necessary to convert the 2000 S4 Bosch Mass Air Flow sensors (MAF) to the later 2001-02 Hitachi design. The other codes we should address are those related to the sensors located after the catalytic converter. Now, at a slightly higher elevation, reading flickers between 1. 0's had MAF's for 03/04, then some 05's don't, but the rest of 05-07 does. 5 volts between terminals A and B of the MAF sensor connector. 0T, Volkswagen Golf V 2. One sensor measures the ambient temperature of the incoming air. Also, my Autoenginuity scanner is not showing any significant readings above 0. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor. ENGINE_POWER CALC. If the sensor is reading out of range, check the sensor’s connection to the intake manifold for a possible vacuum leak. All Sensors Corporation is a leading manufacturer of MEMS piezoresitive ultra low pressure sensors and pressure transducers. Both technicians are correct. 7) to derive the total mass of fuel that has. When checking live data, Mass airflow readings are at 0 with the car running. Testing the Ford mass air flow (MAF) sensor on all of the Ford, Lincoln and Mercury cars and trucks is a very simple test that can be done without a scan tool. Beginning in the late 80s, engines started to rely more and more on sensors and electronics to manage fuel metering, emissions, transmission shift. It makes the MAF system the most forgiving for engine modifications. A fuel-injected engine may alternatively use a mass airflow sensor (MAF sensor) to detect the intake airflow. 4 with a primary and secondary turbo arrangement similar to the 3. View Profile View Forum Posts View Blog Entries. The other type of sensor is a frequency type. The value you get, 'should' be ~80% of the rated horsepower. Reset code and drive vehicle. The powertrain control module (PCM) uses that reading along with other sensor parameters to ensure proper fuel delivery at any given time for optimum power and fuel efficiency. Warning: When this patch is active the ecu will ignore the MAF sensor readings even if it's plugged in, so be careful and tune the ip_maf_1_diag__n__tps_av table very carefully before applying this. This is important as it allows your engine to regulate its performance and change the intake of air to keep your engine running in its best condition. when a vehicle comes in thats running poorly or has stumble when acclerating, after checking basic fuel pressures and spark KV, i check MAF sensors alot by unlugging them. was ~ 14-16. 413 which is about as low a reading as it has given so far. 45 volts (oxygen sensor resistance high), it judges that the air/fuel ratio is lean. Discussion Starter • #1 • Nov 15. - So for example the 1. 5 volts between terminals A and B of the MAF sensor connector. Shake the plastic bag vigorously in order to allow the alcohol to get into all the areas of the MAF. As rewmer said the initial (pre clean) idle reading looked acceptable, after the clean it's still in range - but just. Because the oxygen in that cylinder isn’t burned up, the extra oxygen in that cylinder winds up passing over the O2 sensor. Also, since most MAF meters are on a 5V scale, you’ll probably want to bump the value of P_0522 a bit higher than 4. Mass Air Flow Sensor MAF For Ford E-450 F-250 F-350 F-550 Super Duty 6. Vauxhall Corsa 1. Performed SDS Short Test, DTC 100B00, Upper Limit Reached, 100D00, Lower Limit Reached, 161700 Right Intake Air Temp Sensor Implausible, Performed Guided Test of Mass Air Flow and Temp Sensor Readings, noted Right Side intermittently will read 0% at 178 Degrees F. Ford has used a Hot-Wire type mass air flow sensor for many years that either comes with or without an internal air temperature sensor. This is the second MAP sensor reading. What does this reading indicate? The TP sensor is open at one point during the test. Old Sensor looked brand new so thot it was going to be something else. 0 also uses the same MAF sensors for both intakes, although not the. Use of any other type cleaner may damage the sensor. The MAF sensor can also be dirty or partially plugged with carbon causing a low reading. Should be more like 12-13 from your figures. 0T, Volkswagen Golf VI 2. when a vehicle comes in thats running poorly or has stumble when acclerating, after checking basic fuel pressures and spark KV, i check MAF sensors alot by unlugging them. ENGINE_TORQUE MAF PID This setting tells DashCommand which MAF (mass air flow) PID to use for calculating fuel consumption. be/E8sBg7kMbOw The procedures shown in this video can be applied to all 3-wire General Motors MAF sensors. JET Powr-Flo Mass Airflow Sensors will increase your engine's horsepower, low-end torque, and mileage by replacing the restrictive stock MAF sensor which. Coolant Temp Sensor and Ignition Control Module. – Subpar engine performance. The MAP sensor is usually mounted directly to the intake manifold, somewhere after the throttle body, though some are mounted on the firewall or elsewhere in the engine bay, connected to the intake manifold via a vacuum line. JC – yep, this is new vehicle. 440T4 / 4T60, 4T60-E, & 4T65. After that, I wanted to adjust the MAF table according to the config of MAF-STFT, and it did not work as I just installed the V 3. At Amphenol-ASTG, we make Quality, Safety and Environmental Protection a top priority. I don't see why it would make sense for ford to stop and then start again like that. Much of the design of the upstream (of the MAF) air induction is to protect it from such as water and oil. Good day, I found your article very interesting and helpful, but, i have a question for you. 86mm LS1 shown in photo. Me thinks the MAP is faulty but at £130 a go don't want to commit. at the moment it about 12mpg 80% highway, 20% town. What you are seeing is what I was talking about scaling a MAF. Housings feature a beautifully-crafted sensor flange for clean lines with precision TIG welds. MAP Sensor assembled in the USA, unlike the current Delphi production. Part numbers: AEM 3. A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine. If you are cleaning the MAF sensor, then undo the 2 x 2. A MAF sensor needs to run properly because the ECU needs information about the amount of air in the engine. My MAF Sensor has a reading of 0. At the other end, I could obtain voltage readings in excess of 5 volts, recording 500 CFM at 5. The MAF sensor reads the temperature and the amount of air flowing in the air intake. Leaving the MAF sensor to dry, reinstall the TB in the reverse order of the tear-down. Obtain sensor specifications from a reliable source; you can send us an e-mail from the Help Link and we can assist with most information. the map instead reads barometric and atomspheric pressure changes inside the intake manifold. Water contamination can cause a lean condition. Plug the MAF electrical connector back in. NO-Repair open in the wire between the No. I've viewed the live feed data and confirmed that the sensor will intermittently spike to very high readings and sometimes down to very unusually low readings. 22 g/s at 1. MAP Sensor constantly measures the vacuum in the intake manifold. Try this set of readings. I've cleaned the MAF, and did an OBD log of the MAF sensor at idle. 0T, Volkswagen CC 2. The wiring from the maf appears to go from the maf and joins a larger loom at the top/back of the engine then goes through the firewall into the cabin. The MAF, Mass Air Flow meter is the sensor who indicates to the ECU (car computer) the air mass who flow inside the engine. O-Ring included. I have an engine light on, this time reading MAF sensor, so I am going to replace it. Mouser offers inventory, pricing, & datasheets for Flow Sensors. Step 3 - Soak the MAF in Alcohol. I have increased the RPM's from about 700-2000 and the MAF still shows 0. The ceramic coating on the sensor wire helps maintain accurate readings in both low and high temperature environments. Register or Log In now! Hey! When connecting with a VAG-COM trying to get the airflow, my MAF reads 0. 0 reading for MAF by accident. This family of products is designed to fit Mass Air Flow sensors: 1L3F-12B579-AB/ AFH90-02 and 1L3Z-12B579-AB. well service managers dont no crap, but honestly i know he isnt talking bout his map sensor cause he would really have no reason to mess with it, im imaginig it is his maf, or the baromoter i was talking about which is on the 04 and 05's, and another reason i no it isnt his map sensor because he is talking about on his intake and a map sensor reads manifold pressure, which means its on the. But is reading OK when engine running and rev-ed up. I got faultcode for MAF range. Step 3 - Soak the MAF in Alcohol. The value you get, 'should' be ~80% of the rated horsepower. How about the data set shown in Fig. P1100 MAF Circuit Intermittent Voltage Input. Answer B is wrong. My Revo Settings at B8 T5 F6. 6 petrol did not have a MAF sensor. The ECM receives the air mass value from the mass airflow sensor and then. As this was the first time making a full range of readings it’s possible the procedure still needs some improvement. This Genuine Volkswagen Audi Mass Air Flow Sensor (MAF) (Mfg#06J906461B) fits Audi A3 8P FWD 2. The MAF signal should follow smoothly with changes in engine speed. I disconnected the negative battery terminal while I installed it, the code was there without even starting the engine. Lean and/or rich code(s). 0 range (18% less than normal). My MAF sensor went out on a 2000 Buick Regal, and i replaced the MAF sensor, it was still acting as though it was not working and the service engine light still came on, and the obd still said it was the MAF sensor. my truck had the sensor in the intake but had a factory plug/block off on the wiring harness for the maf plug in Sold puller-1997 f-350 12 valve 913 p-pump, big charger, big fuel, SBC, and so on. "The scan tool reads the MAF value and displays it in grams per second (gm/s). 2 V8 Mass Air Flow Meter MAF Sensor L76 L77 L98 LS2 LS3 Commodore HSV New Genuine LVL2 - Back LH Corner 92281162. If cleaning (only) is needed - then use a spray (aerosol) cleaner designated / formulated for mass air flow meters. 4? In fact, the snapshot was taken during open-loop, closed-throttle. Assuming this test is done at or near sea-level, the peak output of the sensor in g/s should be roughly 80% of the rated horsepower of the engine. It uses two wires to measure the amount of air flowing into the engine. So all similar. A good number for normal passenger vehicle tires is 0. Every MAF is different meaning each one will give a different Hz number the computer reads for a given gram per second of air. (See pix - MAFV is at PID# 1177 and is returning 0. Mass air flow sensor problems Problems mass air flow sensors are very common. I noted that with no airflow through the MAF the voltage reading was 0. The MAF sensor frequency should increase smoothly and gradually in relation to engine speed. Note that clearing fault codes (even if no fault codes exist) will also reset the fuel trim values to 0, so it is essential to do this check before clearing any fault codes. In this case the sensor communicates with the computer by means of a frequency. When connecting with a VAG-COM trying to get the airflow, my MAF reads 0. Yep, stock MAF sensor. The element is cooled as air passes over it, and this information is converted into an electronic pulse to be relayed to the on-board computer, which can then calculate fuel. shore) $60 C&L 80mm MAF Mass Airflow Sensor for 86-93 5. A MAF sensor can be a flow restriction in cases where the MAF housing is the smallest portion of the intake system. If cleaning (only) is needed - then use a spray (aerosol) cleaner designated / formulated for mass air flow meters. AEM Intake temp sensor: 30-2010. Ross-Tech, LLC 881 Sumneytown Pike Lansdale PA 19446, USA Tel: +1 267 638 2300. Under normal circumstances, the temperature of the air is a few degrees cooler than the coolant. I have an engine light on, this time reading MAF sensor, so I am going to replace it. I have a 2004 V70 2. A fuel-injected engine may alternatively use a mass airflow sensor (MAF sensor) to detect the intake airflow. 0 upgraded intake boot plug to aluminum and only affected early kits) After considerable testing, we have found it necessary to convert the 2000 S4 Bosch Mass Air Flow sensors (MAF) to the later 2001-02 Hitachi design. Couple of sensors replaced under warranty, which is good. Turbo R 1994-1993 6. In this case the sensor communicates with the computer by means of a frequency. my 2001 focus 1. My MAF sensor went out on a 2000 Buick Regal, and i replaced the MAF sensor, it was still acting as though it was not working and the service engine light still came on, and the obd still said it was the MAF sensor. The direct measurement of the air entering the engine is more accurate than calculating the airflow from the MAP, the IAT, and the engine speed (speed/density). Yep, stock MAF sensor. Observe and record the scan tool MAP sensor pressure parameter. Thanks a lot for the information. But the MAF reading was very low. 5 YE - 492 - MAF Sensor Signal D - 0. You want your MAF histograms to be as close to 0 as possible when everything is happy. 0 CDTI Engine But This is also a Recommended Thing to do Every 10 or 20. you can also look at #20 for a little more information into MAF readings from this thread. – Increased emissions. A bad MAF sensor will generate a particular code, so it’s easy to tell whether this is the source of your car troubles. BRAND NEW GENUINE Bosch MAF Sensor for 1. 2L 2012, Powr-Flo® Mass Air Flow Sensor by JET®. be/E8sBg7kMbOw The procedures shown in this video can be applied to all 3-wire General Motors MAF sensors. 0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post on-board diagnostics (OBDII) vehicles. 0L, 2001-2005 Audi Allroad 2. A "Meter" often referred to as the "MAF" is the result of the element AND THE HOUSING. A Mass Air Flow Sensor, better known as an MAF, is a perfect compliment to a heavily modified or a forced induction engine. Like I said sort of just found this 0. My MAF reading on my scan gauge reads. The car runs rich at idling or lean when running. You'll notice if the tailpipes eject black smoke or when the engine runs rough or backfires. The MAF signal should follow smoothly with changes in engine speed. When at rest, the MAP sensor reads atmospheric pressure at sea level (29. You are expecting 300-400 mg/stroke at idle and 800-900 mg/stroke at high revs. 5 g/s at idle, then I blip the throttle lightly which is the spike in the graph, then it goes back to idle at about 9. A few minutes more driving and it began to stall every time I came to a stop. 5 BK - 450 - Ground D - 0. The AEM intake temp sensor kit is best to use for the new sensor. Of -course, your car will adjust to faulty sensor readings, so gas mileage can also be caused by a bad sensor. Try a UK supplier although be wary of what freight that want to charge. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor. BMW E39 540i Mass Air Flow Sensors One of the most critical pieces of data collected by your vehicle's ECU is the amount of air available for combustion at a given point. Jump to Latest Follow 1 - 19 of 19 Posts. Ford use an airflow meter (MAF) to tell the computer how much air enters the engine no a MAP sensor. Try cleaning the MAF sensor and recheck operation. A Mass Air Flow Sensor, better known as an MAF, is a perfect compliment to a heavily modified or a forced induction engine. The unit ships with the tuning software and a vehicle specific connection guide for the vehicles listed below. So all similar. I am getting a MAF signal code (P0102) and I know it is not working properly because the signal from signal wire is supposed to change from 0-5 volts when the rpm's increased and yes of coarse I back probed it, I even cut some of the insulation of of wire to make sure I was getting good connection while reading it with my multi-meter. 5L (X) 215" 8-12160-244-0 12130 BENTLEY 8 CYL. This is done by utilizing the load lookup table instead of reading the MAF and feeding this value into all important MAF variables used by the code. The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The drawn transfer curve drawn is from a Bosch 0 280 218 018 MAF. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. Improve the MAF readings "fuel trims" at the ECU. BMW E46 330 Harness - 5 pin MAF. Air changes its density as it expands and contracts with temperature and pressure. I did just clean my MAF last night and it appears my Fuel Trims on average have come closer to zero and are all positive now (average). 2 to 6 is correct MAF reading for warmed up idle, remember it's calculated PCM looks at IAT and MAS (sensor frequency) to calculate the weight of the air in grams per/sec. Over time particles in the air build up on the MAF sensor wire, and need to be cleaned off. Our undercut ends give your silicon hose connection a cleaner transition; … Continue reading →. The mass air flow sensor increases the voltage to maintain the temperature of the sensor. Good day, I found your article very interesting and helpful, but, i have a question for you. See full list on motor. I wonder if there are other people having similar problems. Black smoke coming from the tail-pipe. 35 YE - 492 - Mass Air Flow (MAF) Sensor Signal B - 0. Google "p0171 ford expedition" the code is for a lean condition, it could be a bad airflow meter or it could just be a vacuum leak. Could someone post MAF readings on vehicle with normal MPG more than 14-16? What does it shows on idle?. The main cause of mass air flow failure is dust. Some injection systems use both MAF and MAP sensors. – Increased emissions. The test is best done with the sensor removed from the engine. 09-12-13, 04:50 PM #9. If the result shows that the Ox voltage is greater than 0. must be sucking air in some where. This measurement allows the ECU to perform adjustments which ensure that the engine is performing to an optimum level. My MAF sensor went out on a 2000 Buick Regal, and i replaced the MAF sensor, it was still acting as though it was not working and the service engine light still came on, and the obd still said it was the MAF sensor. Leaving the MAF sensor to dry, reinstall the TB in the reverse order of the tear-down. If you look into the sensor when it becomes defective the filament is missing. I was wondering the same thing about the maf sensor. P1100 MAF Circuit Intermittent Voltage Input. 9 PSIg engine load with the car off. Left Side 44% at 78 Degrees F. The EGR actual trace shows you the Mass Air Flow into the engine recorded by the AMM (MAF) sensor. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor. Observe and record the scan tool MAP sensor pressure parameter. When at rest, the MAP sensor reads atmospheric pressure at sea level (29. Normal readings or is the sensor bad? TIA. This allows the sensor to provide a more accurate reading of the density of air passing through the engine’s intake. you can use a MAF cleaner on a throttle body, but you cannot use throttle body cleaner on a MAF. Apparently it's a GM/Cheverolet performance 3 bar sensor, which should have an approx. This sensor reads the exhaust in order to make necessary adjustments to the A/F ratio. You'll notice if the tailpipes eject black smoke or when the engine runs rough or backfires. You want your MAF histograms to be as close to 0 as possible when everything is happy. Couple of sensors replaced under warranty, which is good. Hook up a scan tool with the ability to monitor sensor valves (PIDS) and pull up the mass air flow sensor. An abnormal reading from a sensor can light up the Check Engine light on the dashboard, meaning that a trouble code has been stored in the computer. 40 lb/min Truck has Billet S366 No limit CAI GH tunes etc. The readings from this sensor are then fed back to the engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing. I cleaned the sensor before thich is ese readings and got slight improvements but only slight. well service managers dont no crap, but honestly i know he isnt talking bout his map sensor cause he would really have no reason to mess with it, im imaginig it is his maf, or the baromoter i was talking about which is on the 04 and 05's, and another reason i no it isnt his map sensor because he is talking about on his intake and a map sensor reads manifold pressure, which means its on the. If you are able to view the MAF sensor signal voltage on an OBD2 scanner, then do so. The Mass Air works with the MAP sensor for accurate air readings. 5L 5 Cyl Replacement OEM# 0280218088, 8670398 together ensuring precise sensor reading and optimal engine performance. Mass Air Flow Sensor MAF For Ford E-450 F-250 F-350 F-550 Super Duty 6. The EGR actual trace shows you the Mass Air Flow into the engine recorded by the AMM (MAF) sensor. The test is best done with the sensor removed from the engine. Buy BR31-12B579-AA Mass Air Flow Meter MAF Sensor for Ford F-150 250 350 Mustang Taurus Fusion Explorer Expedition/Lincoln MKS MKT with fast shipping and top-rated customer service. After cleaning the MAF sensor, I replaced a new air filer. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor. 1 kPa at 0 volts and 315. Run the engine at each of the above-mentioned speeds and record the MAF sensor PID values on the graph. 0 also uses the same MAF sensors for both intakes, although not the. Unplugging MAF normally makes the car use a kind of default reading in place of the MAF sensor reading. I don't see why it would make sense for ford to stop and then start again like that. So my MAF sensor is reading extremely low. The MAF sensor module comes preinstalled in a 3. Wires that are broken, melted against the hot exhaust pipes, or corroded, will give erratic or missing readings. Lean and/or rich code(s). Google "p0171 ford expedition" the code is for a lean condition, it could be a bad airflow meter or it could just be a vacuum leak. The MAF signal should follow smoothly with changes in engine speed. All of this happens in thousandths of a second, so it's understandable that when a mass air meter starts to fail, the engine runs poorly. 100% new, never remanufactured, so there's no leftover debris that can cause sensor failure 100% computer-tested to ensure the ECU receives accurate airflow readings under hard engine conditions, which are required to balance and deliver the correct air/fuel ratio to the engine in order to achieve clean burns. I really hope you found this helpful. This ensures the most efficient air/fuel mixture for the best fuel economy and power. A few minutes more driving and it began to stall every time I came to a stop. I think the light terminal is the one nearest the slot in the side of the sensor head. was ~ 14-16. 07 for lambda. The computer uses this measurement, along with other inputs, to calculate the best air-fuel ratio and spark timing according to engine operating conditions. MafCyl - the air flow that goes into the cylinder (g/sec) MafMap - the manifold air pressure calculated from the MAF reading, Ideal Gas Law, and rpm (kPa). 09-12-13, 04:50 PM #9. 9v it means the engine is running rich. If cleaning (only) is needed - then use a spray (aerosol) cleaner designated / formulated for mass air flow meters. Symptoms were Chk Eng Lite, Power Steer Lite, OBD codes displayed for the sensor & also said Too Rich (Bank One) Car would. If you wish to modify some other 0-5 volt circuit based on RPM and TPS/Manifold Pressure the unit can be applied to your needs. Anyone here know if this is normal or should it read 0 and I need to replace the maf sensor. Some use MAP sensor for Barometric reading during key on startup. The other type of sensor is a frequency type. A MAF sensor needs to run properly because the ECU needs information about the amount of air in the engine. Vehicles prior to 1996 could have MAF without an IAT. OBD2 readings are always the actual readings from a component, OEM side readings may be substituted to keep the vehicle running so they can be misleading. 9 TDI PD Engines fitted with the engine codes listed below - Here at Darkside Developments we only own and work with TDIs, so you can be assured that you are dealing with experts who have an in depth knowledge and understanding of all things VW Diesel. Some also measure the temperature of the air entering the engine. Thread: Mass air flow sensor reading 0. 4 with a primary and secondary turbo arrangement similar to the 3. C) How to Test the MAF Sensor Voltage Signals. This may indicate a dirty filter or a defective mass air flow sensor. If the code comes back, it may be necessary to replace the MAF sensor. 0 also uses the same MAF sensors for both intakes, although not the. Set your meter at or close to 10 V DC. Stock mass air flow sensors are high quality pieces, but with increased air flow processed by the engine, an aftermarket mass air flow sensor becomes a necessary modification in order to safely make more power; As with most sensors on the Mustang, the MAF sends information to the computer as a voltage reading with a maximum value of five volts. Mid throttle and WOT throttle can vary. MAF Sensor Test Drive: A test drive is the best method of testing the MAF sensor. Disconnect the MAF sensor/IAT sensor 5P connector. I really hope you found this helpful. Hot-wire MAF sensor is the most. Kia spectra Location:. 8V at idle, while the downstream O2 sensor (#2) is reading between 0. (See pix - MAFV is at PID# 1177 and is returning 0. Register or Log In now! Hey! When connecting with a VAG-COM trying to get the airflow, my MAF reads 0. than a failing MAF. Just got back from the parts store and changed the MAF sensor and the code is still there. A BMW started using Mass Air Flow sensors (MAF) in the early ’90s on most models (note that MINIs and some latest model BMWs do not use this system and do not have MAF units). We test drove it and it worked on that car, the power was back and it revved right out. If the Ford MAF sensor on your car has 4 wires, then it does not have an air temp sensor integrated. In automotive applications, air density varies with. The pin-out for it is different than the SS & LS3/LS7 card. The MAF sensor module comes preinstalled in a 3. you can also look at #20 for a little more information into MAF readings from this thread. A failure in the MAF sensor or circuit should set DTC P0101, DTC P0102, or DTC P0103. Depending on your MAF sensor, your voltage reading should be between 0. I bought MAF sensor cleaner and a new air filter (the old air filter was very dirty). Record your MAF sensor reading at idle, and again at various RPM ranges. The MAF (Mass Air Flow sensor) is oftern blamed for giving false readings, resulting in poor running, backfiring and lack of performance. min) 3V (2XAA) feed, OBD-II reported MAF V = 2, MAF Rate: 3. My MAF sensor went out on a 2000 Buick Regal, and i replaced the MAF sensor, it was still acting as though it was not working and the service engine light still came on, and the obd still said it was the MAF sensor. Air Flow Meters measure the amount of air passing into the engine from which the computer can work out how much fuel to add to get the perfect mixture for that specific throttle opening, the computer does this by referring to a map in its memory. The 4Runner uses a "Hot Wire" type. This family of products is designed to fit Mass Air Flow sensors: 1L3F-12B579-AB/ AFH90-02 and 1L3Z-12B579-AB. Seeing 150g/m at idle, maxing out at 600g/m around 2000rpm part throttle. Wires that are broken, melted against the hot exhaust pipes, or corroded, will give erratic or missing readings. If there’s no leak, the sensor needs to be replaced. Any help would be appreciated by this new guy. The MAF output must be a smooth even increase as engine speed increases. This indicates the power input to the sensor is correct. If after disconnecting the MAF nothing changes, it means, that MAF has became bad. As air is sucked into the engine past the wire, it has a cooling effect that's offset by an increase in voltage to the sensor to maintain the 212*F. The value you get, 'should' be ~80% of the rated horsepower. Took out the MAF, seems physically fine, but has no brand, the only markings on it is 101 101205, perhaps the previous owner replaced it?. I got live data readings on notepad as a dtc trigger (at idle). This ensures the most efficient air/fuel mixture for the best fuel economy and power. If there’s no leak, the sensor needs to be replaced. Basically this P0101 diagnostic trouble code (DTC) means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The jump wire (I’d use spades on each end) would connect the STI (test input) with #2 pin on the connector, see below:. 02 while using a scan tool. I think these reading are quite high and thought of buying new MAF sensor, does it makes any sense?. Mass Air Flow Sensor MAF For Ford E-450 F-250 F-350 F-550 Super Duty 6. 0 diesel e350 jericho941 IWI. Vehicle may idle rough and stall. my 2001 focus 1. 3 gallons per hour at tickover is more like it. I don't see why it would make sense for ford to stop and then start again like that. This is obviously a lean mixture, in this case caused by a lazy oxygen sensor and a bad plug wire on an '86 Volkswagen Jetta. Check sensor for carbon accumulation or contaminants which can cause false readings. 8 Second pause (for NEW code), and then add the actual. I checked my readings and at 2800 RPM, I am reading 3-4 lbs/min. The 4th wire on the front/primary MAF will most likely be for the ambient air temperature sensor. 0T, Volkswagen EOS 2. I've viewed the live feed data and confirmed that the sensor will intermittently spike to very high readings and sometimes down to very unusually low readings. The donut looked ok, so used a Grade 8 bolt, Bank1 Sensor 1 vs Bank 2 Sensor 1 - iRV2 Forums. 2 - what should MAF reading be? - Railroad. - Mass Air Flow (MAF) meter - Engine Coolant Temperature (ECT) sensor - Fuel pressure - Gas leakage from exhaust system - Open or short in A/F sensor (bank 1, 2 sensor 1) circuit - A/F sensor heater relay - A/F sensor heater and A/F sensor heater relay circuits - PCV hose connections - PCV valve and hose - ECM. 2L 2012, Powr-Flo® Mass Air Flow Sensor by JET®. Bosch uses a hot-wire MAF sensor, which is a platinum wire heated to 212*F (some say 180*F) above ambient temperature. The “air gulp” test uses a labscope to display the MAF output voltage increase during a snap-throttle test, and should show the voltage rising from about 0. Every MAF is different meaning each one will give a different Hz number the computer reads for a given gram per second of air. Record your MAF sensor reading at idle, and again at various RPM ranges. Originally my car ran fine but my husband thought that putting aviation fuel in it would make it run better and give it more hp, over the course of a few weeks my car began acting up and hasn't. In vehicles that are turbocharged or supercharged, the MAP sensor also reads the amount of boost pressure. This family of products is designed to fit Mass Air Flow sensors: 1L3F-12B579-AB/ AFH90-02 and 1L3Z-12B579-AB. This MAP sensor is mounted directly to the intake manifold, but others might be connected by a hose. In most cases, the MAF sensor will realize the change in airflow, and the fueling will still be correct. If yours is reading 0. To make sure the MAF was the culprit one of the other guys had us unplug it. I had a diagnostic done today. 5L,09-15 370Z 3. 0 also uses the same MAF sensors for both intakes, although not the. but undriveable until I can get the part and do. Mass Air Flow Sensor Meter MAF for BMW E36 E39 E46 3 Series 5 Series Z3 Series Land Rover Freelander Suzuki Verona & Volvo S40 V40 2. How to Clean MAF Sensor This simple cleaning can make your truck's idle smoother and prevent an expensive replacement. BRAND NEW GENUINE Bosch MAF Sensor for 1. Hot-wire MAF sensor is the most. Thanks for the help. The MAF sensor is connected to the ECU using a wiring harness. at the moment it about 12mpg 80% highway, 20% town. Bosch 0 281 002 757 Mass Air Flow Sensor Assembly Updated Version, different design than older MAF, beware of some suppliers selling the original version as an updated version, always check the Bosch part number to be sure. Just figured if it is a bad MAF reading 0 the car wouldn't start but I really don't know. If the readings are highest at idle, look for a vacuum leak. Record your MAF sensor reading at idle, and again at various RPM ranges. The wiring from the maf appears to go from the maf and joins a larger loom at the top/back of the engine then goes through the firewall into the cabin. 0 Liter Engine. The MAF sensor could get contaminated or damaged. The MAF sensor reads the temperature and the amount of air flowing in the air intake. The mass air flow sensor increases the voltage to maintain the temperature of the sensor. Simply removing an element from it's housing and placing it in a different sized housing/pipe will give you a COMPLETELY DIFFERENT METER or "MAF SENSOR". FREE Shipping on orders over $100! 0% Financing Available - Learn More. Also, my Autoenginuity scanner is not showing any significant readings above 0. The vast majority of all MAF and MAP sensors are of this type. When the flow of air enters the fuel injection system of the engine, the mass air flow sensor will analyze how much air is flowing in there. Ford F-150 3. 2L 2012, Powr-Flo® Mass Air Flow Sensor by JET®. If MAF was bad to run 18% lean you MAF would have to be in the 3. 440 lb/min rate. Hot-wire MAF sensor is the most. Should be more like 12-13 from your figures. This is done by utilizing the load lookup table instead of reading the MAF and feeding this value into all important MAF variables used by the code. 366 lb/min and returning the revs to idle, at 872 rpm the MAF is reading 0. Intentionally blank: Intentionally blank: Related Parts. MAP Sensor assembled in the USA, unlike the current Delphi production. AWM700 Series Amplified / Compensated Airflow Sensor - AWM720P1 / AWM730B5. There is the full throttle/full load test others use and that is measure the MAF sensor readings at full throttle in 2/3 gear and the engine at maximum rpm. JET Powr-Flo Mass Airflow Sensors will increase your engine's horsepower, low-end torque, and mileage by replacing the restrictive stock MAF sensor which. This test will help you check the condition of this wire. I was wondering the same thing about the maf sensor. The car has a billet MAF housing, 750 injectors, hybrid engine, VF39, samco turbo inlet hose, and a custom tune. When the mass, and speed, of air increases inside the intake tube, the heated sensor is cooled. ID The Mass Air flow Sensor (photo) I think I’m going to end up replacing this, but I just want to make sure that THIS is the Mass Air Flow Sensor… Post categories In Volvo Experiences , Volvo 850 , Volvo S70 & V70 1998-2000 , Engine , Volvo XC70 & V70XC , Volvo C70 , Sensors. You may see black exhaust smoke or the turbo may not be spinning up to full boost as well. 55grams/second minimum to 1. Mass Air Flow (MAF) Sensor Adaptor Kit 3 Inch Alloy Tube with 3 flow calibration tubes + 5 mass air flow sensor adaptors. It was read from a BMW scanner, and I get the same code on my snap on scanner. 0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post on-board diagnostics (OBDII) vehicles. 6 from the UK. Couple of sensors replaced under warranty, which is good. my 2001 focus 1. Toggle navigation 0 items in cart: / $0 found the mass air flow sensor they had installed on my 2000 Buick was not reading and since the one year warranty had. Hello everyone, I have a 2013 Volvo S60 T5 2. 5 the sensor is the back sensor on the manifold. MAF Codes that light up the CHECK ENGINE LIGHT (CEL) on your Instrument Cluster: P0102 MAF Signal Low Input to PCM. The MAF features a sensing element, which. must be sucking air in some where. Both outputs are sent to the engine control module to regulate air-fuel mixture and the automatic transmission system. Thanks for reading this article on cleaning a Mass Airflow Sensor. Calibration is linear with 1. Just replaced MAF sensor on 2012 3i 2L Skyactive. Notice the IAT sensor on the right; it's part of the MAF assembly but it is not used for measuring airflow. Cleaning them is very quick and painless, just be sure to use the proper chemicals. value: 0 -5 V. The data from the MAF sensor is simply a voltage between 0v and 5. How to Clean MAF Sensor This simple cleaning can make your truck's idle smoother and prevent an expensive replacement. Is that normal? Although the vacuum intake doesn't suction anything, it's possible to have leak or vacuum canister failure. When checking live data, Mass airflow readings are at 0 with the car running. 0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post on-board diagnostics (OBDII) vehicles. 0 SOHC (no mods - bone stock)? My g/f's Focus has a nasty (rough) idle. The jump wire (I’d use spades on each end) would connect the STI (test input) with #2 pin on the connector, see below:. You'll notice if the tailpipes eject black smoke or when the engine runs rough or backfires. 9 TDI PD Engines fitted with the engine codes listed below - Here at Darkside Developments we only own and work with TDIs, so you can be assured that you are dealing with experts who have an in depth knowledge and understanding of all things VW Diesel. A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine. It doesn't. This is important as it allows your engine to regulate its performance and change the intake of air to keep your engine running in its best condition. 3L V8 > Exhaust & Emission > Mass Air Flow. The code reads: [8 DME Signal, air-mass flow sensor]. The wiring from the maf appears to go from the maf and joins a larger loom at the top/back of the engine then goes through the firewall into the cabin. Most modern MAF sensors also contain an IAT sensor. The MAF sensor is used to measure intake air volume for use in calculations to determine fuel and timing. I think the light terminal is the one nearest the slot in the side of the sensor head. I really hope you found this helpful. The car has a billet MAF housing, 750 injectors, hybrid engine, VF39, samco turbo inlet hose, and a custom tune. Thanks for the help. It was read from a BMW scanner, and I get the same code on my snap on scanner. Just got back from the parts store and changed the MAF sensor and the code is still there. Before replacing the mass air flow sensor check for air leaks in the connecting air ducts and intake manifold. I got faultcode for MAF range. The unit ships with the tuning software and a vehicle specific connection guide for the vehicles listed below. Have tried replacing the MAF - no luck. Fuel trim code(s). ) - Clogged up or improperly installed air filter - The mass air flow sensor element contaminated by excess oil from an oil-soaked air filter - Clogged-up catalytic converter or restricted exhaust Other possible. Reset code and drive vehicle. well service managers dont no crap, but honestly i know he isnt talking bout his map sensor cause he would really have no reason to mess with it, im imaginig it is his maf, or the baromoter i was talking about which is on the 04 and 05's, and another reason i no it isnt his map sensor because he is talking about on his intake and a map sensor reads manifold pressure, which means its on the. For Figure B. 0L V8 Sensor and housing are calibrated and sold together ensuring precise sensor reading. Leaks in the air induction system or intake manifold can cause the MAF sensor to produce false readings, so can faulty wiring. Apparently it's a GM/Cheverolet performance 3 bar sensor, which should have an approx. Like the MAP sensor, if a trouble code sets for a MAF sensor error, some things must first be checked before replacing the sensor. 0 Mustang (Fairmount / Museums area) $75. This upgrade provides a more precisely calibrated metered air flow than the factory stock Ford Mustang MAF Sensor. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. Shake the plastic bag vigorously in order to allow the alcohol to get into all the areas of the MAF. 75% of zero or tighter. 0 Liter Engine. 15 at idle and the highest I've seen it go is the 1. A Mass Airflow -- MAF -- Sensor in a modern Ford vehicle is located inside the air intake duct. If the result shows that the Ox voltage is greater than 0. 7T, and 2001-2002 Audi S4 2. if its still operating withing its Hertz and grams per second perameters it will not set a code. 0 range (18% less than normal). This sensor is linked to the vehicle’s computer system, and in the event that there’s a leak in the EVAP, or perhaps a problem with the sensor, you will see a “check engine” signal. YAOPEI Mass Air Flow Sensor Meter Replace# 22680-7S000 AF10141 for Nissan Infiniti Altima G37 Suzuki,07-13 Sentra,05-15 Xterra,03-09 350Z 3. Jump to Latest Follow 1 - 19 of 19 Posts. wrt OBDII logs, however, MAP sensor seems to read low at 100KPA. Run the engine at each of the above-mentioned speeds and record the MAF sensor PID values on the graph. Exhaust leaks can cause oxygen sensor to send a false lean reading. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. Obtain sensor specifications from a reliable source; you can send us an e-mail from the Help Link and we can assist with most information. 440 lb/min rate. Replacing a mass air flow sensor is fairly straight forward, so most of the cost comes from the cost of the part, and not the labor. Only one terminal of the sensor will give you a reading, and that one is for the gauge. I have heard some say the unplugging the MAF thing as a test doesn't work, but it is worth a try, imho. MAF sensor while doing a full throttle run in 2nd gear, as shown in Figure B. Should be more like 12-13 from your figures. This is important as it allows your engine to regulate its performance and change the intake of air to keep your engine running in its best condition. Beginning in the late 80s, engines started to rely more and more on sensors and electronics to manage fuel metering, emissions, transmission shift. 0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post on-board diagnostics (OBDII) vehicles. Benji Jerew/Flickr/CC BY 2. Locate you MAF sensor, which is the black box sitting on top of your metal airbox-to-intake snorkel mount. - Mass Air Flow (MAF) meter - Engine Coolant Temperature (ECT) sensor - Fuel pressure - Gas leakage from exhaust system - Open or short in A/F sensor (bank 1, 2 sensor 1) circuit - A/F sensor heater relay - A/F sensor heater and A/F sensor heater relay circuits - PCV hose connections - PCV valve and hose - ECM. Like I said sort of just found this 0. The total mass of air which flows through the engine (as measured by the MAF sensor or calculated using MAP, RPM and IAT) is divided by the A/F ratio (e. I really hope you found this helpful. Air changes its density as it expands and contracts with temperature and pressure. The main cause of mass air flow failure is dust. 7g/s would cause the car to run 34% richer, if your AFR learning is -10%, the -25% AFR correction would bring you to a total of -35%. Can someone with a monitor check their MAF readings for me? Trying to diagnose an overfueling issue and I believe tha MAss Airflow Sensor could be the issue. The ECM uses MAP sensor data to run crucial calculations, such as engine load, fuel injector pulse, and spark advance. The 4th wire on the front/primary MAF will most likely be for the ambient air temperature sensor. If after disconnecting the MAF nothing changes, it means, that MAF has became bad. Mass air flow sensor problems Problems mass air flow sensors are very common. 0 diesel e350 jericho941 IWI. There are two sensors in the MAF. CHEVROLET > 2004 > TAHOE > 5. A replacement mass air flow sensor can cost anywhere from $20 to $600. If the code comes back, it may be necessary to replace the MAF sensor. 52 for B2S2. I am getting a MAF signal code (P0102) and I know it is not working properly because the signal from signal wire is supposed to change from 0-5 volts when the rpm's increased and yes of coarse I back probed it, I even cut some of the insulation of of wire to make sure I was getting good connection while reading it with my multi-meter. Disconnect the MAF sensor/IAT sensor 5P connector. 0 Liter Engine. Also, they said the Mass air-flow sensor needed to be serviced. 0 range (18% less than normal). MAF Values For a Typical Test Drive KOEO 0. C&L 80mm MAF Mass Airflow Sensor for 86-93 5. A fuel-injected engine may alternatively use a mass airflow sensor (MAF sensor) to detect the intake airflow. The 3 wire sensor connector has good power and ground with the. Then, measure the voltage between MAF sensor connector terminals C and D. 2 V8 Mass Air Flow Meter MAF Sensor L76 L77 L98 LS2 LS3 Commodore HSV New Genuine LVL2 - Back LH Corner 92281162. It's running really rich - started looking into codes and I have a P0102 'MAF Sensor low frequency'. It is located in the air filter housing 6 wire connector attached to it (5 wires in the connection). Ford has used a Hot-Wire type mass air flow sensor for many years that either comes with or without an internal air temperature sensor. If the MAF sensor frequency reading is erratic, replace the sensor. The wiring from the maf appears to go from the maf and joins a larger loom at the top/back of the engine then goes through the firewall into the cabin. 5 kPa at 5 volts. Jump to Latest Follow 1 - 19 of 19 Posts. Mass air flow sensor problems Problems mass air flow sensors are very common. At idle, it should read between 4gm/s - 7gm/s on a fully warmed up engine. I am getting a MAF signal code (P0102) and I know it is not working properly because the signal from signal wire is supposed to change from 0-5 volts when the rpm's increased and yes of coarse I back probed it, I even cut some of the insulation of of wire to make sure I was getting good connection while reading it with my multi-meter. Disconnect the MAF sensor/IAT sensor 5P connector. The vast majority of all MAF and MAP sensors are of this type. Another simple method to check MAF sensor Disconnecting the MAF and starting engine may help to determine whether the MAF is really causes a problem. Both sensor designs output a 0. I drove more than 200 miles for two days, and it was fine. If the MAF sensor has 6 wires, then this is a dead giveaway that it has the air temp sensor integrated inside. Subtract the second MAP sensor reading from the first MAP sensor reading. My MAF reading on my scan gauge reads. If you are able to view the MAF sensor signal voltage on an OBD2 scanner, then do so. 0 fox body that I can't seem to figure out what's wrong so far the opinion has been either the maf sensor or the O2 sensor. This upgrade provides a more precisely calibrated metered air flow than the factory stock Ford Mustang MAF Sensor. 0L, 2001-2005 Audi Allroad 2. To make sure the MAF was the culprit one of the other guys had us unplug it. Vehicles with ESM use bothINCHES OF MERCURY (IN-HG) AND IN HERTZ the MAP and MAF for engine-running BARO (HZ). 3 gallons per hour at tickover is more like it.